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/** Read thread's userspace register state (istate_t).
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/** Read thread's userspace register state (istate_t).
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 *
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 *
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 * - ARG2 - thread identification
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 * - ARG2 - thread identification
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 * - ARG3 - destination address in the caller's address space
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 * - ARG3 - destination address in the caller's address space
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 * - ARG4 - size of receiving buffer in bytes
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 *
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 * on answer, the kernel will set:
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 *
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 * - ARG1 - actual size in bytes of data read
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 * - ARG2 - total size in bytes of data available
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 *
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 *
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 * or, on error, retval will be
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 * or, on error, retval will be
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 * - ENOENT - thread does not exist
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 * - ENOENT - thread does not exist
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 * - EBUSY - register state not available
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 * - EBUSY - register state not available
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 */
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 */
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/** Write thread's userspace register state (istate_t).
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/** Write thread's userspace register state (istate_t).
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 *
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 *
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 * - ARG2 - thread identification
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 * - ARG2 - thread identification
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 * - ARG3 - source address in the caller's address space
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 * - ARG3 - source address in the caller's address space
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 * - ARG4 - size of source data in bytes
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 *
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 * on answer, the kernel will set:
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 *
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 * - ARG1 - actual size in bytes of data copied
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 * - ARG2 - max size in bytes that could have been copied
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 *
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 *
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 * or, on error, retval will be
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 * or, on error, retval will be
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 * - ENOENT - thread does not exist
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 * - ENOENT - thread does not exist
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 * - EBUSY - register state not available
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 * - EBUSY - register state not available
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 */
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 */